/*
 * Copyright (C) 2008 Universidade Federal de Campina Grande
 *  
 * This file is part of OurGrid. 
 *
 * OurGrid is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free 
 * Software Foundation, either version 3 of the License, or (at your option) 
 * any later version. 
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details. 
 * 
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package org.ourgrid.peer.controller;

import java.util.Collection;

import org.ourgrid.common.interfaces.RemoteWorkerProvider;
import org.ourgrid.common.interfaces.RemoteWorkerProviderClient;
import org.ourgrid.common.interfaces.to.RequestSpec;
import org.ourgrid.peer.PeerConstants;
import org.ourgrid.peer.dao.DiscoveryServiceClientDAO;

import br.edu.ufcg.lsd.commune.container.servicemanager.ServiceManager;
import br.edu.ufcg.lsd.commune.identification.DeploymentID;

/**
 * Implements Community Obtainer actions.
 */
public class CommunityObtainerController {
	
	private static CommunityObtainerController instance; 
	
	private CommunityObtainerController() {};
	
	public static CommunityObtainerController getInstance() {
		if (instance == null) {
			instance = new CommunityObtainerController();
		}
		return instance;
	}
	
	public void request(RequestSpec requestSpec, ServiceManager serviceManager) {
		
		DiscoveryServiceClientDAO dsClientDAO = serviceManager.getDAO(DiscoveryServiceClientDAO.class);
		Collection<RemoteWorkerProvider> workerProviders = dsClientDAO.getRemoteWorkerProviders();
		
		serviceManager.getLog().debug("Request "+requestSpec.getRequestId()+": request forwarded to community.");
		
		for (RemoteWorkerProvider remoteWorkerProvider : workerProviders) {
			
			serviceManager.getLog().debug("Request "+ requestSpec.getRequestId() +": requesting workers " +
					"from a remote worker provider ["+ serviceManager.getStubDeploymentID(remoteWorkerProvider) +"].");
			
			RemoteWorkerProviderClient rwpc = (RemoteWorkerProviderClient) serviceManager.getObjectDeployment(
					PeerConstants.REMOTE_WORKER_PROVIDER_CLIENT).getObject();
			
			DeploymentID stubDeploymentID = serviceManager.getStubDeploymentID(remoteWorkerProvider);
			
			//TODO temporary solution
			if (stubDeploymentID != null) {
				remoteWorkerProvider.requestWorkers(rwpc, requestSpec);	
			}
		}
		
	}
	
}